%% dx = (0.125,0.125)
solution = [
9.76996e-15 -1.6988e-14 2.87556e-14 1.54255e-14 1.74874e-14 -2.56733e-14 -8.98581e-14 3.05658e-15 1.8559e-14 
1.19189 0.456115 -0.842791 -1.10116 8.04294e-16 1.10116 0.842791 -0.456115 -1.19189 
2.10942e-15 1.28612e-15 3.20621e-15 1.79913e-15 -2.89626e-15 -1.08677e-14 -1.59081e-14 -1.03022e-14 -6.43234e-15 
-1.19189 -0.456115 0.842791 1.10116 -3.1307e-15 -1.10116 -0.842791 0.456115 1.19189 
-1.42743e-15 -8.54024e-16 -1.26035e-16 -7.00368e-16 -2.85778e-15 -5.41053e-15 -6.80532e-15 -6.16125e-15 -5.01273e-15 
1.19189 0.456115 -0.842791 -1.10116 -2.21121e-15 1.10116 0.842791 -0.456115 -1.19189 
-6.36613e-15 -3.16719e-15 -8.5296e-16 8.40593e-16 3.29498e-16 -2.76488e-15 -3.92886e-15 -3.85984e-15 -3.68092e-15 
-1.19189 -0.456115 0.842791 1.10116 5.42942e-15 -1.10116 -0.842791 0.456115 1.19189 
-6.06139e-14 5.11895e-15 1.22365e-16 1.82731e-14 1.84667e-14 -1.53484e-14 -6.64054e-15 1.38592e-15 4.89859e-16 
];
exact = [
0 0 -0 -0 -0 0 0 -0 -0 
1 0.382683 -0.707107 -0.92388 -1.83697e-16 0.92388 0.707107 -0.382683 -1 
1.22465e-16 4.68652e-17 -8.65956e-17 -1.13143e-16 -2.24964e-32 1.13143e-16 8.65956e-17 -4.68652e-17 -1.22465e-16 
-1 -0.382683 0.707107 0.92388 1.83697e-16 -0.92388 -0.707107 0.382683 1 
-2.44929e-16 -9.37304e-17 1.73191e-16 2.26285e-16 4.49928e-32 -2.26285e-16 -1.73191e-16 9.37304e-17 2.44929e-16 
1 0.382683 -0.707107 -0.92388 -1.83697e-16 0.92388 0.707107 -0.382683 -1 
3.67394e-16 1.40596e-16 -2.59787e-16 -3.39428e-16 -6.74892e-32 3.39428e-16 2.59787e-16 -1.40596e-16 -3.67394e-16 
-1 -0.382683 0.707107 0.92388 1.83697e-16 -0.92388 -0.707107 0.382683 1 
-4.89859e-16 -1.87461e-16 3.46382e-16 4.5257e-16 8.99856e-32 -4.5257e-16 -3.46382e-16 1.87461e-16 4.89859e-16 
];
err = [
9.76996e-15 -1.6988e-14 2.87556e-14 1.54255e-14 1.74874e-14 -2.56733e-14 -8.98581e-14 3.05658e-15 1.8559e-14 
0.191886 0.0734316 -0.135684 -0.17728 9.87991e-16 0.17728 0.135684 -0.0734316 -0.191886 
1.98696e-15 1.23925e-15 3.29281e-15 1.91227e-15 -2.89626e-15 -1.09808e-14 -1.59947e-14 -1.02553e-14 -6.30987e-15 
-0.191886 -0.0734316 0.135684 0.17728 -3.3144e-15 -0.17728 -0.135684 0.0734316 0.191886 
-1.1825e-15 -7.60293e-16 -2.99226e-16 -9.26653e-16 -2.85778e-15 -5.18425e-15 -6.63213e-15 -6.25498e-15 -5.25766e-15 
0.191886 0.0734316 -0.135684 -0.17728 -2.02751e-15 0.17728 0.135684 -0.0734316 -0.191886 
-6.73353e-15 -3.30778e-15 -5.93174e-16 1.18002e-15 3.29498e-16 -3.10431e-15 -4.18865e-15 -3.71925e-15 -3.31352e-15 
-0.191886 -0.0734316 0.135684 0.17728 5.24572e-15 -0.17728 -0.135684 0.0734316 0.191886 
-6.0124e-14 5.30641e-15 -2.24017e-16 1.78206e-14 1.84667e-14 -1.48958e-14 -6.29416e-15 1.19846e-15 0 
];
